黄土塬区煤系非常规气地震勘探资料处理方法的应用研究

地震勘探是解决煤系非常规气储层富集区预测的有效手段,结合黄土塬区工区实例介绍了煤系非常规气地震资料处理方法在该地区的应用研究。勘探区内地表沟谷纵横、起伏变化剧烈,地形较为复杂,根据地质任务要求进行煤系非常规气富集性的地震勘探预测,对AVO属性进行分析及波阻抗反演,因此进行地震资料保幅处理是其中重要的一个环节,需要在解决激发和接收条件不同带来的振幅和频率差异的的基础之上,同时得到较高的纵、横向分辨率。通过折射静校正和层析静校正的对比和分析,较好地解决了由于地表问题带来的野外静校正上的难题。通过精细的速度分析和剩余静校正技术,较好地解决了道集拉平问题,为后续AVO反演提供了借鉴。

Application research on seismic data processing approach of unconformity gas in coal measures of Loess Yuan region

Seismic exploration is an effective method to forecast unconformity gas enrichment area in coal measures.According to the working zone of Loess Yuan region,it introduced the application research on seismic data processing approach of unconformity gas in coal measures.In the exploration area the ground surface is sharp fluctuant topography and there are many hills and dales,so the topography is complex,for meeting the geological tasks of forecasting unconformity gas enrichment area in coal measures,we need to take attribute analysis of AVO and take the impedance inversion.Based on the structural exploration,the seismic data relative amplitude preserved processing is one of the important link.To address the problem,at the same time we can get the higher resolution of vertical and horizontal based on the difference of amplitudes and frequencies caused by the difference between the excitation condition and the receiving condition.According to the comparison and the analysis about the refraction statics and the tomography statics,it took a better job to work out the problem of field statics caused by the complex surface.According to the elaborate velocity analyses and the technology of residual static correction,it took a better job to work out the problem of trace gather flattening,and it provides the basis for the next AVO inversion.